Bottom bed structure

ABSTRACT

A bottom bed structure includes a rectangular bottom bed frame having supported thereon a plurality of coil springs and a plurality of beam members having pressed out portions forming protruding resilient lip portions. A pair of oppositely positioned lip portions receives the lowest spring coil turn and fixedly secures the coil turn in the spacing formed between the lower surfaces of a pair of oppositely positioned protruding resilient lip portions and the upper surface of the beam member. The resilient lip portions make frictional contact with the lowest spring coil turn.

D United States Patent 1191 1111 3,750,201

Usami Aug. 7, 1973 1 BOTTOM BED STRUCTURE 3,091,450 5/1963 Reed 267/862,773,271 12/1956 Wetzler.... [76] Inventor Ikegamh 3,623,171 11 1971Arkin 5 351 Ohtaku, Tokyo, Japan [22] Filed: Sept. 8, 1971 PrimaryExaminer-Casmir A. Nunberg N0: Att0rney0tt0 John Munz [30] ForeignApplication Priority Data {57] ABSTRACT Sept. 8, 1970 Japan 45/89714 Abottom bed Structure ihhludes a rectangular bottom May 25, 1971 Japan;46/41993 bed frame having Supported thereon a plurality of Aug. 5, 1971Japan 46/70006 Springs and a plurality of beam members having pressedout portions forming protruding resilient lip 52 us. (:1 5/263, 5/248,5/310 portiohs- A p of pp y Positioned p Portions 51 Int. Cl. A47 23/04receives the lowest Spring coil turn and fixedly Secures 5s 1 Field ofSearch 297/456; 5/234, 248, the mm in the Spacing formed between thelower 5/263 351 353 310; 2 7 30 86, 92, 2 surfaces of a pair ofoppositely positioned protruding resilient lip portions and the uppersurface of the beam [56] References Ci member. The resilient lipportions make frictional con- UNITED STATES PATENTS tact with the lowestspring coil turn.

2,832,966 511958 Frey; 5/248 3 Claims, 7 Drawing Figures PATENIEUAus 1ms SHEET 1 BF 2 INVENTOR NOBUO USAMI BY W A ORNEY Hummus H915 3.750.201

sum 2 or 2 IN VENTOR NOBUO USAMI BY W A ORNEY DETAILED DESCRIPTIONOF THEINVENTION This invention relates to a bottom bed structure having animprovedmounting structure for fixedly securing coil springs to beammembers.

A known bottom bed structure has wooden beam members on which aplurality of coil springs are supported in position. Each of the coilsprings is generally fitted to the corresponding beam member by means ofa wire penetrating through the wall of the beam member. On the topsurfaces of the coil springs a cushioning layer and cover .sheet aredisposed to constitute a bottom bed structure.

Such an'operation offitting coil'springs to the beam member, however,requires performing complicated work and thus-resulting in an increasein cost.

An object of this invention is to'provide an improved bottom bedstructure which is capable of overcoming the problem of the known bottombed structure mentioned above.-According to this invention, a pluralityof beam members are used, each of which is-supported on transversemembers thatare disposed across the opposite side members of a bottombed'frame and has a plurality of pressed out protruding resilient lipportions, Each lip portion is formed integrally with the beam member andhas a lower surface disposed above the upper surface of the beam member.The spacings "formed between the lower surface of the lipportions andthe upper surface of'the beam member provides an enclosurefor-the lowestturnportion of an individual coil spring. The resilient lip'portionispressed downwardly to make frictional contact against the lowest turnportion of the coil spring, thereby the coil spring issecurely'fitted.to the beam member.

Another object of this invention is to provide a bottom bed structure inwhich the lowestturn portion of an individual coilspring is securelyheld in the spacings formed between the .upper surfaces of a beammemberi'andthe lower surface of azprotruding lip portions formedintegrallytherewith. I

A'further object of thisinvention is to provide a bottom bed structurewhich'is .easily assembled by simple operations as compared with theknown manufacturing of bottom bed structures,'with the result thattheproduction rate'of-speed is increased-and, the cost is decreased.

In the accompanying drawings:

FIG. I is axplan view of a bottombed structure according to thisinvention;

FIG. 2 is asectional view along the line I] ll of FIG. 1; I

FIG. 3 is a partialxperspective view of the structure F IG. 6 is anenlarged perspective view showing a part ofa beam member and acoilspring used in thestructure shown in FIG. and

FIGL7 is aexploded perspective view showing a part of areinforcingmember and leg member.

PREFERRED EMBODIMENTS OF THE INVENTION Referring nowto the accompanyingdrawings, particularly to FIGS. 1 to 3, reference numeral v1 denotes arectangular bottom bed frame which is made of a light weight metalmaterial and comprises a plurality of transverse members or plates 2 ina predetermined spaced parallel relationship to each other. On each ofthe plates 2 a plurality of beam members 3 are arranged in a spacedrelationship as in extend to a direction parallel to the longer side ofthe frame 1 and are secured to the plates 2 by suitable fitting means.Preferably, each of the members 3 has a pair of flanges 4 on oppositesides thereof. Bolts or studs 5 secure the beam members 3 to the plates2.

Each beam member 3 has a top wall 3' and a series of lip portions 6 and7 which are formed integrally by punching or pressing out a part of thetop wall. Each lip portion forms a hollow channel or spacing 8 or 9having a triangular cross section (FIG. 4).

The lip portions 6 and 7 are spaced from each other by a distance equalto that of the diameter of the lowest turn 10' of a coil spring 10 whichis to be fitted to the beam member 3. Each of the coil springs 10 isfitted to the beam member 3by inserting the lowest turn 10' of thespring 10 through the respective spacings 8 and 9 that are formedbetween the lower surfaces of the lip portions 6 and 7 and the uppersurface of the beam member '3.

After being fitted to the beam member 3, the'coil springs 10 areconnected to each other at the top portion by means of S.C.C. springs 11and wire springs l2, and then covered with a cushioning layer andcovering sheet (not shown). To each of the corners of the lower surfaceof the bed frame 1 leg members 13 aresecured.

FIGS. Sand 6 illustrate a bottom bedstrlucture according toanotherembodiment of this invention in which a plurality of lip portions 14formed in thebeam member 3 having spacings 15 of rectangular. crosssection. The-spacings l5 serve as an enclosure for the lowest turn 10'of the coil spring 10. The lip portion is depressed downwardly tosecurely establish frictional contact with and hold the spring betweenthe lower surfaces of the lip portions and the upper surface 3" of thebeam member 3.

Theleg members 13 may be fitted to thelowersurface of the bed frame 1.Alternatively, as shown in FIG. 7, each leg member 13 maybeconstructed-to have a threaded portion '16 which is screwed-into athreaded hole 17 which is'formed'in a reinforcing member 18.

The member 18 maybe fitted on the lowersurface of theplate 2 by means ofsuitable fitting studs.

What is claimed is:

1. A bottom bedstructure comprisingin combination:

a rectangular bottom bed frame;

a plurality of transverse members supported in a spaced parallelrelationship to each other on said rectangular frame and beingperpendicularly positioned to the length of said rectangular frame;

a plurality of beam members mounted on said transverse members andarranged parallel to the=length of said rectangular frame; and

a plurality of coil springs, each of which includes a turn portion onthe lowest part of the spring coil;

downwardly to make frictional contact with said lowest spring coil turn.

2. A bottom bed structure as claimed in claim 1 wherein each of saidspacings has a rectangular cross section.

3. A bottom bed structure as claimed in claim 1 wherein each of saidpair of oppositely positioned lip portions is spaced from each other bya distance equal to that of the diameter of said lowest spring coilturn. l l I I

1. A bottom bed structure comprising in combination: a rectangularbottom bed frame; a plurality of transverse members supported in aspaced parallel relationship to each other on said rectangular frame andbeing perpendicularly positioned to the length of said rectangularframe; a plurality of beam members mounted on said transverse membersand arranged parallel to the length of said rectangular frame; and aplurality of coil springs, each of which includes a turn portion on thelowest part of the spring coil; each of said beam members having a topwall member, said top wall member having a series of pressed outportions forming pairs of oppositely positioned protruding resilient lipportions, each pair of oppositely positioned lip portions receiving thelowest spring coil turn and fixedly securing said coil turn in spacingsformed between the lower surfaces of each said pair of protruding lipportions and the upper surface of said beam member; each said pair ofresilient lip portions being pressed downwardly to make frictionalcontact with said lowest spring coil turn.
 2. A bottom bed structure asclaimed in claim 1 wherein each of said spacings has a rectangular crosssection.
 3. A bottom bed stRucture as claimed in claim 1 wherein each ofsaid pair of oppositely positioned lip portions is spaced from eachother by a distance equal to that of the diameter of said lowest springcoil turn.